The iambic trimeter derives its name from its essential shape, which is three metrical units (hence trimeter) which are each basically iambic in form. The iambic metron has the following shape (where the x is an anceps, the - is a longum, and the u is a brevis):
Hence, reversing the current running though a wire will have the affect of reversing the direction of the magnetic force at a point some distance away from the wire. The affect that this has on the overall magnetic field depends on the shape of the wire.
Consistent with Lenz's law, the direction of the induced electromotive force, or voltage, is in the opposite direction of the current flow that generated it. Looking at Faraday's experiment again below, we find that when voltage is applied to the coil on the right, a magnetic field is induced in the iron ring.